OO-3847: make OAuth as default provider configurable

src/main/java/org/olat/login/_spring/loginContext.xml

@@ -45,7 +45,7 @@
 	<bean id="OAuthAuthenticationProvider" class="org.olat.login.oauth.OAuthAuthenticationProvider" >
 		<constructor-arg index="0" value="OAuth"/>
 		<constructor-arg index="1" value="org.olat.login.oauth.ui.OAuthAuthenticationController"/>
-		<constructor-arg index="2" value="false"/>
+		<constructor-arg index="2" value="${oauth.default}"/>
 		<constructor-arg index="3" value="o_icon_provider_oauth"/>
 	</bean>
 	

src/main/resources/serviceconfig/olat.properties

@@ -822,6 +822,9 @@ olatprovider.default=true
 # if you change this all current users will no longer be able to login!
 default.auth.provider.identifier=OLAT
 
+# Oauth / social providers as default
+oauth.default=false
+
 shibboleth.enable=false
 #enable and or set the generic shib login provider on the loginpage active and or default
 shibbolethGeneric.enable=false